Kenichi Ushikoshi*, Yoshinori Kajiyama*, Toshiyuki Kobayashi* and Satoshi Tsuchiya*

* Shinko Pantec Company Ltd.

+ Correspondence should be addressed to Kenichi Ushikoshi:
(1-1-4, Murotani, Nishi-ku, Kobe, 651-22 Japan)

Abstract

Reverse osmosis systems can simultaneously remove highly concentrated salts and heavy metals and recalcitrant substances contained in the leachate from landfill site. A test plant for leachate treatment, using a reverse osmosis DT-Module with a plate and frame configuration developed by Rochem, has been operated and tested to treat leachate in Japan which came from landfill site where ash mainly from incineration plant had been dumped. The test result showed that the operational performance was very stable even at a recovery rate of 95%, producing very high-grade treated water much like clean city water. For the concentrate treatment produced by the from reverse osmosis system, many cases and methods were proposed. It is highly feasible to construct leachate treatment systems in Japan which produces very clean water like potable water by using DT-Module in combination with a concentrate treatment system.

Key words: leachate, reverse osmosis, nanofilter, DT-Module, high salinity